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@auch gisten atrat @fitta D. B. HART, 0F MENTOB., OHIO.

Letters Paten IVO. 07,539, dated August 6', 1867.

IMPROVEMENT IN NUTS AND WASHERS.

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TO ALL WHOM IT MAY CONCERN:

Beit known that LD. B. HART, of Mentor, in the county of Lake, and State of Ohio, have invented a new device for Bolt-Nuts and Washers, to prevent their 'becoming loose; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, in which- Figure I represents a nut andwasher provided with my said device.

Figures 2 and 3, central vertical sections of the same.

Figure 4, perspective view showing a washer having a modification of the same device.

Figures 5 and 6, central vertical sections of said washer and a plain nut.

Figure 7, perspective viewr of a washer having another modiicationvof same device, and used with a plain' nut, and V Figure 8, a central vertical section of said washer.

The same letters of reference indicate similar parts.

The loosening of bolt-nuts is a4 fruitful source of complaint with those who use machinery., Farmers, especially, are often annoyed by the nuts of their farmingA implements becoming loose and dcranging the parts. (ftentiincs nuts drop ofl` and are lost, frequently involving a serious loss from stoppage of work.

The object of this invention is a deviceby which the evil can be eii'ectually remedied. It consists in forming a groove, channel, or chamber in thewasher commonly uscdon bolts, or in the .va'isher and nut combined, and filling said channel with an India-rubber or other elastic packing, and so as that it (the packing) will not spread laterally outward, or arranging it so that, if desirable, said packing may spread laterally inward and press against the sides of the bolt; and thus aifcrd additional hold, as will be explained. The main object of the invention being to confine said packing so as not to spread outward, thereby insuring a vertical elasticity when pressed by the screwing down of the nut and thus preventall possibility-of its turning back and becoming loose.

The following' description will show the construction and operation of my said device:

A, iig. l, is a` metallic washer, and vB the elastic 'packing in the sunk channel thereof. This channel or chamber is shown in iig. 3, and is, it will be observed, of a daring or dove-tailed form for the better holding the packing in place. V The nut C is alsoprepared with such a channel, D, for receiving packing. Fig. 2 shows the form ofit. The object in using flaring or dove-tailed sides in the channels o rapertures of the washer or nut, is to retain the packing so as to prevent its easilyslipping out. But straight-sided channels or apertures can he used to prevent packing spreading, except when ii: is required to do so inwardly.

The above description fully illustrates the principle'of my said device; but in order to meet all mechanical variations, which will embodythe said principle, and to provide for particular uses, I here illustrate three additional forms: Fig. 4 and its section, iig. i5, show that the packing may-be confined within a central aperture, E, having a V-shaped formA of channel', F, and a hole, G, through it for the bolt, so that the nut, iig.v 6, (which is a plain one, having no packing) when it presses on said packing, will spread around `the bolt and give additional hold, as seen. Fig. 7 is the otherform; in this the washer has sunk aringchannel, H, to receive the packing, as seen in the section, iig. 8; a plain nut, iig. 5,--being used.

My said device is thus used: When the bolt, as represented in iig. 1, is in its place, the washer A is put on and the nut C screwed down. It will he seen that, in tightening the nut, the elasticity of the packing, by its not spreading, will always be in firm contact with the face of the Washer, and, by its peculiar adhesion, prevent its turninghaclc, unless by force purposely applied; andalso that the packing B, in the centre of the said washer, willspread towards and around the shaft of thebolt,thusvgiving additional hold. The other form, as delineated in figs. 4, 5, and, and used with a plain nut, presses on the central packing, and spreads in the same way around the bolt. The remaining form, iigs. 7 and 8, has the packing of the washer so arranged, asshown, as not to spread outward or inward.' This and the preceding form will meet most cases; but the rst may be adopted when extra adhesion is required. i

What I claimv as my invention, and'desirc to secure by Letters Patent, isi The within-named device, constructed and operating as described, or' its equivalent, as a. new andoriginal Inode for the purpose set forth, and used in either or all of the forms herein delineated and described;

D. B. .HART.

Witnesses:

JQF. SINGLE, M. S. HARVEY. 

